drm/i915/ppgtt: Fix ioctl errno for "no such context"
Without this fix the ioctls silently succeeded (but actually did nothing). It makes all the code which calls into this function way too confusing. v2: Fix destroy IOCTL as well v3: Clarify the other two callers of i915_gem_context_get() to never check for NULL. (Mika) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72903Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Testcase: igt/gem_ctx_exec/basic [danvet: Fix up the commit message and actually bother to mention the testcase this fixes.] Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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